Implement declarativeContent API.

chrome/browser/extensions/extension_action.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/extensions/extension_action.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 254 matching lines @@
   // When showing a script badge for the first time on a web page, fade it in.
   // Other transitions happen instantly.
   if (old_appearance == INVISIBLE && tab_id != kDefaultTabId &&
       action_type_ == extensions::ActionInfo::TYPE_SCRIPT_BADGE) {
     RunIconAnimation(tab_id);
   }
 
   return true;
 }
 
+void ExtensionAction::DeclarativeShow(int tab_id) {
+  DCHECK_NE(tab_id, kDefaultTabId);
+  ++declarative_show_count_[tab_id];  // Use default initialization to 0.
+}
+
+void ExtensionAction::UndoDeclarativeShow(int tab_id) {
+  int& show_count = declarative_show_count_[tab_id];
+  DCHECK_GT(show_count, 0);
+  if (--show_count == 0)
+    declarative_show_count_.erase(tab_id);
+}
+
 void ExtensionAction::ClearAllValuesForTab(int tab_id) {
   popup_url_.erase(tab_id);
   title_.erase(tab_id);
   icon_.erase(tab_id);
   badge_text_.erase(tab_id);
   badge_text_color_.erase(tab_id);
   badge_background_color_.erase(tab_id);
   appearance_.erase(tab_id);
+  // TODO(jyasskin): Erase the element from declarative_show_count_
+  // when the tab's closed.  There's a race between the
+  // PageActionController and the ContentRulesRegistry on navigation,
+  // which prevents me from cleaning everything up now.
   icon_animation_.erase(tab_id);
 }
 
 void ExtensionAction::PaintBadge(gfx::Canvas* canvas,
                                  const gfx::Rect& bounds,
                                  int tab_id) {
   badge_util::PaintBadge(
       canvas,
       bounds,
       GetBadgeText(tab_id),
@@ skipping 82 matching lines @@
   icon_animation->Start();
   // After the icon is finished fading in (plus some padding to handle random
   // timer delays), destroy it. We use a delayed task so that the Animation is
   // deleted even if it hasn't finished by the time the MessageLoop is
   // destroyed.
   MessageLoop::current()->PostDelayedTask(
       FROM_HERE,
       base::Bind(&DestroyIconAnimation, base::Passed(icon_animation.Pass())),
       base::TimeDelta::FromMilliseconds(kIconFadeInDurationMs * 2));
 }